Cu-based catalyst, its preparation process and use thereof

a technology of cu-based catalysts and catalysts, applied in the field of cu-based catalysts, to achieve the effect of high selectivity to acetoin products, and easy large-scale industrial production

Active Publication Date: 2019-05-16
CHINA PETROCHEMICAL CORP +1
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0081]The Cu-based catalyst according to the present invention, in an embodiment, can be used as a dehydrogenation catalyst to produce acetoin, and shows a high acetoin selectivity.
[0082]The process for producing acetoin according to the present invention, in an embodiment, can be utilize a biomass-based material such as 2,3-butanediol as starting material and belongs to a green production technology.
[0083]The process for producing acetoin according to the present invention, in an embodiment, has a high selectivity to the acetoin product, and is easy for the large-scale industrial production.
[0084]The process for producing acetoin according to the present invention, in an embodiment, has an acetoin product essentially free the harmful impurities such as sulfur and nitrogen.

Problems solved by technology

Because the thiazole salt catalyst used in this process is expensive and difficult to separate from the product, the commercially available acetoin food additive will contain more or less a certain amount of harmful impurities such as sulfur and nitrogen.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cu-based catalyst, its preparation process and use thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0238]The preparation of the Cu-based catalyst H1 was as follows:

[0239](1-1) 122 g of copper nitrate, 103 g of ytterbium nitrate and 88 g of aluminum nitrate were dissolved in 1 L of deionized water to formulate a solution A1. 16 g of potassium hydroxide and 24 g of potassium bicarbonate were dissolved in 1 L of deionized water to formulate a solution B1. 1 L of deionized water was added to a 5 L beaker, and warmed up and maintained at 75° C., and under a continuous stirring, to the beaker were added dropwisely the solutions A1 and B1, and the pH value was maintained at about 8.0. After the completion of the dropwise addition, the mixture was continuously stirred for 2 hours, then aged by standing for 2 hours, and filtered to produce a precipitate C1.

[0240](1-2) The precipitate C1 was placed at 110° C. and dried for 24 hours, and then calcined at 400° C. for 5 hours. Then a graphite powder as lubricant was added in an amount of 3% by weight of the precipitate. The mixture was shaped...

example 2

[0244]The preparation of the Cu-based catalyst H2 was as follows:

[0245](1) The catalyst H1 prepared in Example 1 was used as the catalyst precursor;

[0246](2) The above catalyst precursor H1 was ground into powder. The powder H1 was added to the straight sample tube of TP-5082-type chemisorption instrument, and warmed up to 100° C. in the nitrogen atmosphere and kept constantly at this temperature. The feeding was switched to a mixed gas of acetoin / nitrogen having an acetoin volumetric fraction of 1% and treated for 48 hours. The reaction system was cooled and removed to produce a catalyst H2.

[0247]By elemental analysis, the catalyst H2 had the CuO content by weight of 40.1%, the Yb2O3 content by weight of 44.0%, the K2O content by weight of 2.6%, the Al2O3 content by weight of 12.1%, and the acetoin content by weight of 1.2%.

[0248]The catalyst H2 was subjected to the following pre-treatment before it was used in the dehydrogenation reaction of dihydric alcohol to prepare the hydroxy...

examples 3-7

[0251]The pre-reduced catalyst H1 obtained in Example 1 and the pre-treated catalyst H2 obtained in Example 2 were used as catalyst respectively to investigate the reaction performance for the production of acetoin by the direct dehydrogenation of 2,3-butanediol in a fixed bed reactor having an inner diameter of 10 mm. The experiment results were listed in Table 1.

TABLE 1ReactionReactionAcetointemperaturepressureLHSV2,3-butanediolselectivityAcetoinExampleCatalyst(° C.)(MPa)(h−1)Diluentconversion (%)(%)yield (%)3H12300.13No55.669.438.64H22300.13No49.597.148.15H22500.23No67.296.264.76H22700.23No78.893.974.07H23000.013No79.293.173.7

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
pressureaaaaaaaaaa
temperatureaaaaaaaaaa
temperatureaaaaaaaaaa
Login to view more

Abstract

The present invention relates to a Cu-based catalyst, a preparation process thereof and its use as the dehydrogenation catalyst in producing a hydroxyketone compound such as acetoin. Said Cu-based catalyst contains copper, at least one auxiliary metal selected from metal of Group IIA, non-noble metal of Group VIII, metal of Group VIB, metal of Group VIIB, metal of Group IIB and lanthanide metal of periodic table of elements, and an alkali metal, and further contains at least one ketone additive selected from a ketone represented by formula (II) and a ketone represented by formula (II′). Said Cu-based catalyst shows a high the acetoin selectivity as the dehydrogenation catalyst for producing acetoin.
R1-C(═O)—CH(OH)—R2  (II)
R1-C(═O)—CH(═O)—R2  (II′)
In formulae (II) and (II′), each group is defined as in the description.

Description

TECHNICAL FIELD[0001]The present invention relates to a Cu-based catalyst, in particular to a Cu-based dehydrogenation catalyst. The present invention also relates to a preparation process for the Cu-based catalyst and its use as the dehydrogenation catalyst in the production of hydroxyketone compound such as acetoin.BACKGROUND[0002]Acetoin, also known as 3-hydroxybutanone, is naturally found in many foods such as corn, grapes, apples, meat, etc. It is a widely used flavoring with a pleasant creamy aroma, and mainly used to produce cream, dairy, yogurt, and strawberry-type spices and the like. Acetoin is also an intermediate for many drugs.[0003]The acetaldehyde condensation method is the main production process of food additive grade acetoin in China. Because the thiazole salt catalyst used in this process is expensive and difficult to separate from the product, the commercially available acetoin food additive will contain more or less a certain amount of harmful impurities such as...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): B01J23/889B01J23/86B01J23/83B01J23/78B01J37/00B01J37/03B01J37/08B01J37/34C07C45/00
CPCB01J23/8892B01J23/868B01J23/83B01J23/78B01J37/0009B01J37/031B01J37/08B01J37/343C07C45/002C07C49/17B01J37/036B01J37/18B01J23/80B01J31/0202B01J31/0208B01J2523/00Y02P20/52B01J2523/13B01J2523/17B01J2523/31B01J2523/3787B01J2523/847B01J2523/27B01J23/002B01J37/0201B01J2523/22B01J2523/23B01J2523/842B01J2523/67B01J2523/72
Inventor QIAO, KAIZHOU, FENGSU, JIEMA, HUIXIAZHAI, QINGTONGZHANG, SHUMEI
Owner CHINA PETROCHEMICAL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap